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March 2026

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Help with implementing Cocoa backend (1. scroll pane coordinates/size; 2. menu bar implementation)
by 凉凉 23 Mar '26

23 Mar '26

The backend implementation source code could be found at: https://codeberg.org/li-yiyang/McCLIM/src/branch/backend-coca (backend-coca branch, under Backends/coca) The current screenshot could be see at: https://mastodon.social/@lucky_magick/116279407124461376 1. Issue: the scrolling part effective height is not stretched down correctly 2. Need Advice: how to suppress the menu-bar to use native menu-bar? I read on the manual that it's possible. It's sad that currently if triggering menu-bar would pop drop down menu in another window, which would cause current backend crash. Dev Note: The McCLIM-Coca should be able to load like: git clone --branch backend-coca https://codeberg.org/li-yiyang/McCLIM.git ;; due to Cocoa limits, GUI thread (NSApp run) will replace the main thread sbcl --eval "(ql:quickload '(:clim-listener :mcclim-coca))" \ --eval "(bt:make-thread (lambda () (setf clim:*default-server-path* :coca) (clim-listener:run-listener)))" ;; ECL could also load, but breaks down frequently Why not old beagle backend: I wrote a little ObjC bridge to replace CCL's objc bridge. (Backends/coca/objc) The API (lockFocus) is outdated and cannot work on my computer. So I use CGBitmapContext to replace. I don't have much ObjC Cocoa programming experience so not sure if the ObjC code is correct. I have to ask AI to generate ObjC code and rewrite their logic into lisp code. (Hopefully this would be blamed) Thanks for your time reading this. 凉凉, Yiyang Li, thebigbigwordl(a)qq.com

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